EP1729817A1 - Gene delivery system containing relaxin gene and pharmaceutical composition using relaxin - Google Patents
Gene delivery system containing relaxin gene and pharmaceutical composition using relaxinInfo
- Publication number
- EP1729817A1 EP1729817A1 EP05856302A EP05856302A EP1729817A1 EP 1729817 A1 EP1729817 A1 EP 1729817A1 EP 05856302 A EP05856302 A EP 05856302A EP 05856302 A EP05856302 A EP 05856302A EP 1729817 A1 EP1729817 A1 EP 1729817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- relaxin
- tumor
- gene
- adenovirus
- delivery system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2710/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsDNA viruses
- C12N2710/00011—Details
- C12N2710/10011—Adenoviridae
- C12N2710/10311—Mastadenovirus, e.g. human or simian adenoviruses
- C12N2710/10341—Use of virus, viral particle or viral elements as a vector
- C12N2710/10343—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
Definitions
- the present invention relates to a novel gene delivery system and recombinant adenovirus , in particular, to a novel gene delivery system and recombinant adenovirus comprising the relaxin-encoding sequence, a pharmaceutical anti-tumor composition comprising the recombinant adenovirus , a pharmaceutical composition characterized by improved tissue penetration potency and a pharmaceutical composition for treating a disease or disorder associated with accumulation of excess extracellular matrix .
- Gene therapy is directed to the treatment of a pathological condition by introducing an exogenous gene into cells or tissues .
- hereditary diseases such as sickle cell anemia, Cx 1 antitrypsin deficiency, phenylketonuria, hemophilia and cystic fibrosis
- the aim of gene therapy is to replace a missing or defective gene in order to allow a cell or tissue to function normally .
- gene therapy is used to remove aberrant cells .
- Gene therapy permits to treat various diseases such as cancer, inflammation and autoimmune diseases by delivering genes capable of causing the death of target aberrant cells .
- adenovirus-based gene therapy usually employs replication-incompetent adenoviruses carrying a therapeutic gene with deleted El gene essential for adenovirus replication .
- these recombinant adenoviruses induce anti-tumor activity only in infected cells and a very small number of surrounding cells , exhibiting serious problems in clinical applications .
- the oncolytic adenovirus ONYX- 015 (dll520 ) selectively replicating in tumor cells has been developed .
- the ElB 55 kDa gene-deleted adenovirus selectively replicates in tumor cells lacking functional p53.
- the recombinant adenovirus infects normal cells , its proliferation is inhibited to result in the failure of oncolysis because p53 inactivation is not induced, whereas it actively proliferates in tumor cells with inactivated p53 and eventually leads to selective death of tumor cells (Chang, F. , et al . , J Clin Oncol 13 : 1009-22 ( 1995) ) .
- a tumor-specific oncolytic adenovirus exhibits considerable therapeutic efficacy (Kirn, D . , et al . , Wa t Med 4 : 1341-2 ( 1998 ) ; Nemunaitis , J . et al . , Cancer Res 60 : 6359-66 (2000 ) ; and Ganly, I . et al . , Clin Cancer Res 6 : 798- 806 ( 2000 ) .
- the recombinant adenovirus induces the partial suppression of tumor growth, the complete eradiation of tumor does not been found and regrowth of tumor rapidly occurs after the lapse of a period of time .
- Theses results are probably because the recombinant adenovirus topically inj ected into tumor are partially spread within a limited surrounding portion to elicit a restricted anti-tumor activity such that tumor cells not infected with viruses rapidly grow .
- the recombinant adenoviruses administered into human tumor in nude mice persistently replicate as late as 100 days after initial viral inj ection and do not ensure the complete eradication of tumor, while viable viruses may be obtained from tumor tissue ( Sauthoff, H . et al . , Human Gene Therapy 14 : 425-433 (2003 ) ) .
- the ideal tumor- specific oncolytic adenovirus has the ability to induce greater oncolytic activity and spread throughout tumor tissue as well for infecting surrounding tumor cells .
- the present inventors have made intensive researches to improve the transduction efficiency of gene delivery systems , particularly, to enhance the transduction (or spreading) efficiency of gene delivery systems in tissues , as a result, discovering that relaxin could dramatically improve the transduction efficiency of gene delivery systems .
- a gene delivery system comprising a nucleotide sequence of interest to be delivered into a cell , the improvement which comprises a relaxin-encoding nucleotide sequence to enhance a transduction efficiency of the nucleotide sequence of interest into the cell .
- the present inventors have made intensive researches to improve the transduction efficiency of gene delivery systems , particularly, to enhance the transduction (or spreading) efficiency of gene delivery systems in tissues .
- Such researches are based on our hypothesis that the reduction in the level of components of extracellular matrix by facilitating the degradation or inhibiting the synthesis of components of extracellular matrix may enhance the spreading of gene delivery systems within tissues .
- the present inventors have discovered that relaxin could dramatically improve the transduction efficiency of gene delivery systems .
- Relaxin that plays a pivotal role as an enhancer in improving transduction efficiency in the present invention, is a 6 kDa peptide hormone, structurally related to insulin and insulin-like growth factors ( IGFs ) . It is predominantly produced in corpus luteum and endometrium and its serum level greatly increases during pregnancy (Sherwood, O . D . et al . , Dynamic changes of multiple forms of serum immunoactive relaxin during pregnancy in the rat . Endocrinology 114 : 806-13 ( 1984 ) .
- Relaxin is known to facilitate the growth and regeneration of placenta and uterus and loosen of uterine cervix to broaden birth canal during parturition . It promotes the expression of various MMPs in birth canal tissues such as MMP2 , MMP3 and MMP9 to degrade collagen, so that connective tissues and basal membranes are degraded to lead to the disruption of extracellular matrix of birth canal . In addition to this , the promotion of MMP 1 and MMP 3 expressions by relaxin is also observed in lung, heart, skin, intestines , mammary gland, blood vessel and spermiduct where relaxin plays a role as an inhibitor to prevent overexpression of collagen (Qin, X . , et al .
- the relaxin protein expressed induces the degradation of collagen, a maj or component of extracellular matrix surrounding cells , to disrupt connective tissue and basal membrane, thereby resulting in the degradation of extracellular matrix .
- This successive action is one of mechanisms underlying the improvement in transduction efficiency by relaxin, which is clearly verified in Examples described below.
- the advantages of the present gene delivery system is highlighted for cells within tissues composed of cells interconnected each other by extracelluar matrix .
- the present gene delivery system exhibits improved transduction efficiency compared to any conventional delivery system.
- the term "gene delivery” used herein refers to the transfer of gene into cells and has the same meaning as gene transduction .
- the gene delivery becomes the same meaning as spread of gene . Therefore , the gene delivery system of this invention is also expressed as either gene transduction system or gene spreading system.
- the relaxin-encoding nucleotide sequence is contained in a suitable expression construct .
- the relaxin-encoding nucleotide sequence is operatively linked to a promoter .
- the term "operatively linked” refers to functional linkage between a nucleic acid expression control sequence (such as a promoter, signal sequence, or array of transcription factor binding sites ) and a second nucleic acid sequence, wherein the expression control sequence affects transcription and/or translation of the nucleic acid corresponding to the second sequence .
- the promoter linked to the relaxin gene is operable in, preferably, animal , more preferably, mammalian cells , to control transcription of the relaxin gene, including the promoters derived from the genome of mammalian cells or from mammalian viruses , for example, CMV (cytomegalovirus ) promoter, the adenovirus late promoter, the vaccinia virus 7.5K promoter, SV40 promoter, HSV tk promoter, RSV promoter, EFl alpha promoter, metallothionein promoter, beta-actin promoter, human IL-2 gene promoter, human IFN gene promoter, human IL-4 gene promoter, human lymphotoxin gene promoter and human GM-CSF gene promoter .
- the promoter is CMV promoter .
- the expression construct used in this invention comprises a polyadenylation sequence (e . g . , bovine growth hormone terminator and SV40-derived polyadenylation sequence ) .
- the expression construct for the relaxin-encoding nucleotide sequence has a structure of "promoter-relaxin-encoding nucleotide sequence- polyadenylation sequence .
- the nucleotide sequence of interest to be delivered into cells may be contained in an expression construct having the same structure for that for the relaxin-encoding nucleotide sequence .
- the nucleotide sequence of interest to be delivered into cells may be any sequence , for example , including cancer- therapeutic genes encoding proteins having anti-tumor activity and eventually degenerating tumor cells such as tumor suppressor genes , immunomodulatory genes [e . g, cytokine genes , chemokine genes and costimulatory factor genes (for T cell activity such as B7.1 and B7.2 ) ] , antigenic genes , suicide genes , cytotoxic genes , cytostatic genes , pro-apoptotic genes and anti-angiogenic genes , but not limited to .
- cancer- therapeutic genes encoding proteins having anti-tumor activity and eventually degenerating tumor cells
- immunomodulatory genes e . g, cytokine genes , chemokine genes and costimulatory factor genes ( for T cell activity such as B7.1 and B7.2 )
- antigenic genes e. g, cytokine genes , chemokine genes and costimulatory factor genes (for T cell activity such as B7.1 and
- the suicide genes encode proteins capable of conferring to tumor cells sensitivity to chemotherapeutic agents , or of inducing toxic conditions in tumor cells .
- the most well-known suicide gene is the herpes simplex virus-thymidine kinase (HSV- TK) gene (U . S . Pat . Nos . 5, 631 , 236 and 5, 601 , 818 ) .
- Cells expressing HSV-TK are susceptible to selective cell death by gancyclovir .
- the tumor suppressor genes encode polypeptides to inhibit tumorigenesis .
- the tumor suppressor genes are inherent in mammalian cells and their deletion or inactivation is believed to be a prerequisite for tumorigenesis .
- tumor suppressor genes include members of the tumor suppressor gene INK4 family, which are exemplified by APC, DPC4 , NF-I , NF-2 , MTSl , WTl , BRCAl , BRCA2 , VHL, p53 , Rb, MMAC-I , MMSC-2 , retinoblastoma gene (Lee et al . , Nature, 329 : 642 ( 1987 ) ) , gene of adenomatous polyposis coli protein (Albertsen et al . , U . S . Pat . No .
- nasopharyngeal carcinoma tumor suppressor gene that maps at chromosome 3p21.3 (Cheng et al . , Proc. Na tl . Acad. Sci . , 95 : 3042-3047 ( 1998 ) ) , deleted in colon carcinoma (OCC) gene, MTSl , CDK4 , VHL, plOORb, pl 6 and p21 , and and therapeutically effective fragments thereof (e . g . , p56Rb, p94Rb) . It will be understood that other known anti-tumor genes can be used by those of ordinary skill in the art .
- antigenic genes refers to a nucleotide sequence coding for antigenic cell surface protein which is recognized by the immune system.
- antigenic genes include carcinoembryonic antigen (CEA) , prostate specifc antigen ( PSA) , ⁇ -feto protein (AFP) and p53 (WO 94 /02167 ) .
- CEA carcinoembryonic antigen
- PSA prostate specifc antigen
- AFP ⁇ -feto protein
- p53 WO 94 /02167
- cytotoxic gene refers to a nucleotide sequence, the expression of which in a cell elicits a toxic effect .
- examples of the cytotoxic genes include nucleotide sequences encoding Pseudomonas exotoxin, ricin toxin, diphtheria toxin and the like .
- cytostatic gene refers to a nucleotide sequence, the expression of which in a cell induces an arrest in the cell cycle .
- examples of the cytostatic genes include , but are not limited to, p21 , retinoblastoma gene , E2F- Rb fusion protein gene, genes encoding cyclin-dependent kinase inhibitors such as pl6, pl5, pl8 and pl9, growth arrest specific homeobox (GAX) gene (WO 97/16459 and WO 96/30385) .
- Non-limiting examples of the therapeutic genes include genes encoding cytokines. (e . g . , interferon- ⁇ , interferon- ⁇ , interferon- ⁇ and interferons) , interleukin (e . g . , IL-I , IL-2 , IL-4 , IL-6, IL-7 , IL-10 , IL-12 , IL-19 and IL-20 ) , colony-stimulating factors (e . g .
- cytokines e . g . , interferon- ⁇ , interferon- ⁇ , interferon- ⁇ and interferons
- interleukin e . g . , IL-I , IL-2 , IL-4 , IL-6, IL-7 , IL-10 , IL-12 , IL-19 and IL-20
- colony-stimulating factors e . g .
- MCP- 1 monocyte chemotactic protein 1
- MCP-2 monocyte chemotactic protein 2
- MCP-3 monocyte chemotactic protein 3
- MCP-4 macrophage inflammatory protein l ⁇ (MI P-IQ) , macrophage inflammatory protein l ⁇ (MI P-l ⁇ ), macrophage inflammatory protein l ⁇ (MIP-l ⁇ ) , macrophage inflammatory protein 3d (MIP-3 ⁇ ) , macrophage inflammatory protein 3 ⁇ (MIP-3 ⁇ ) , chemokine (ELC) , macrophage inflammatory protein 4 (MIP-4 ) , macrophage inflammatory protein 5 (MIP-5) , LD78 ⁇ , RANTES , SIS-epsilon
- the therapeutic genes include genes encoding tissue-type plasminogen activator (tPA) or urokinase-type plasminogen activator, and LAL-generating gene to provide sustained thrombolysis for preventing hypercholesterolemia .
- nucleotide sequences available for treatment of various diseases including cystic fibrosis , adenosine deaminase deficiency, AIDS and other infectious diseases , and malignant and inflammatory diseases are known to be useful as therapeutic genes .
- pro-apoptotic genes examples include p53 , adenovirus E3-11.6K (derived from Ad2 and Ad5 ) or adenovirus E3-10.5K (derived from Ad) , adenovirus E4 gene , Fas ligand, TNF- ⁇ , TRAIL, p53 pathway genes and genes encoding a series of caspases .
- anti-angiogenic gene refers to a nucleotide sequence, the expression of which results in the extracellular secretion of anti-angiogenic factors .
- Anti- algiogenesis factors include angiostatin, inhibitors of vascular endothelial growth factor (VEGF) such as Tie 2 ( PNAS, 1998 , 95, 8795-8800 ) , and endostatin .
- VEGF vascular endothelial growth factor
- endostatin endostatin .
- the nucleotide sequences of interest described previously are available from DNA sequence databases such as GenBank and EMBL .
- the gene delivery system of the present invention is constructed in a variety of forms , preferably, ( i ) naked recombinant DNA molecule , ( ii ) plasmid, (iii ) viral vector, or ( iv) liposome or neosome containing naked recombinant DNA molecule and plasmid .
- the relaxin-encoding nucleotide sequence may be applied to a multitude of gene delivery systems useful in gene therapy, preferably, . plasmid, adenovirus (Lockett LJ, et al . , Clin . Cancer Res . 3 : 2075-2080 ( 1997 ) ) , adeno-associated virus (AAV, Lashford LS . , et al . , Gene Therapy Technologies, Applica tions and Regulations Ed. A. Meager, 1999) , retrovirus (Gunzburg WH, et al . , Retroviral vectors . Gene Therapy Technologies, Applica tions and Regula tions Ed . A .
- the gene delivery system of this invention is constructed by incorporating the relaxin- encoding nucleotide sequence to adenoviruses .
- Adenovirus has been usually employed as a gene delivery system because of its mid-sized genome, ease of manipulation, high titer, wide target-cell range , and high infectivity . Both ends of the viral genome contains 100-200 bp ITRs ( inverted terminal repeats ) , which are cis elements necessary for viral DNA replication and packaging .
- the El region (ElA and ElB) encodes proteins responsible for the regulation of transcription of the viral genome and a few cellular genes . The expression of the E2 region (E2A and E2B) results in the synthesis of the proteins for viral DNA replication .
- the deleted E3 region in adenoviral vectors may provide an insertion site for transgenes (Thimmappaya, B . et al . , Cell, 31 : 543-551 ( 1982 ) ; and Riordan, J . R. et al . , Science, 245 : 1066- 1073 ( 1989 ) ) . Therefore, it is preferred that the relaxin- encoding nucleotide sequence is inserted into either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted E3 region .
- the nucleotide sequence of interest to be delivered is preferably inserted into either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted El region . Furthermore, the inserted sequences may be incorporated into the deleted E4 region .
- the term "deletion" with reference to viral genome encompasses whole deletion and partial deletion as well .
- the adenoviral gene delivery system of this invention comprises both "promoter-nucleotide sequence of interest-poly A sequence" and "promoter-relaxin gene-poly A sequence” .
- the promoter- nucleotide sequence of interest-poly A sequence is preferably present in either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted El region .
- the promoter-relaxin gene- poly A sequence is preferably present in either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted E3 region .
- the adenoviral gene delivery system may comprise a bicistronic expression system in which the nucleotide sequence of interest and relaxin-encoding nucleotide sequence are linked each other by IRES ( internal ribosome entry site ) to form "promoter-nucleotide sequence of interest-poly A sequence-relaxin gene-poly A sequence .
- IRES internal ribosome entry site
- adenovirus can package approximately 105% of the wild-type genome , providing capacity for about 2 extra kb of DNA (Ghosh-Choudhury et al . , EMBO J. , 6 : 1733-1739 ( 1987 ) ) .
- the foreign sequences described above inserted into adenovirus may be further inserted into adenoviral wild- type genome .
- the adenovirus may be of any of the 42 different known serotypes or subgroups A-F.
- Adenovirus type 5 of subgroup C is the most preferred starting material for constructing the adenoviral gene delivery system of this invention . A great deal of biochemical and genetic information about adenovirus type 5 is known .
- the foreign genes delivered by the present adenoviral gene delivery system are episomal , and therefore , have low genotoxicity to host cells . Therefore , gene therapy using the adenoviral gene delivery system of this invention may be considerably safe .
- Retrovirus Retroviruses capable of carrying relatively large exogenous genes have been used as viral gene delivery vectors in the senses that they integrate their genome into a host genome and have broad host spectrum.
- the relaxin- encoding nucleotide sequences and the nucleotide sequence of interest to be transferred are inserted into the viral genome in the place of certain viral sequences to produce a replication-defective virus .
- a packaging cell line containing the gag, pol and env genes but without the LTR ( long terminal repeat) and ⁇ components is constructed (Mann et al . , Cell, 33 : 153-159 (1983) ) .
- the ⁇ sequence allows the RNA transcript of the recombinant plasmid to be packaged into viral particles , which are then secreted into the culture media (Nicolas and Rubinstein "Retroviral vectors , " In : Vectors : A survey of molecular cloning vectors and their uses, Rodriguez and Denhardt (eds . ) , Stoneham: Butterworth, 494-513 ( 1988 ) ) .
- the media containing the recombinant retroviruses is then collected, optionally concentrated and used for gene delivery .
- Adeno-associated viruses are capable of infecting non- dividing cells and various types of cells , making them useful in constructing the gene delivery system of this invention .
- the detailed descriptions for use and preparation of AAV vector are found in U . S . Pat . No . 5, 139 , 941 and 4 , 797 , 368.
- a recombinant AAV virus is made by cotransfecting a plasmid containing the gene of interest (i . e . , relaxin gene and nucleotide sequence of interest to be delivered) flanked by the two AAV terminal repeats (McLaughlin et al . , 1988 ; Samulski et al . , 1989) and an expression plasmid containing the wild type AAV coding sequences without the terminal repeats (McCarty et al . , J. Virol . , 65 : 2936-2945 ( 1991 ) .
- viral vectors may be employed as a gene delivery system in the present invention .
- Vectors derived from viruses such as vaccinia virus ( Puhlmann M . et al . , Human Gene Therapy 10 : 649-657 ( 1999 ) ; Ridgeway, "Mammalian expression vectors , " In : Vectors : A survey of molecular cloning vectors and their uses . Rodriguez and Denhardt , eds . Stoneham: Butterworth, 467- 492 ( 1988 ) ; Baichwal and Sugden, "Vectors for gene transfer derived from animal DNA viruses : Transient and stable expression of transferred genes , " In : Kucherlapati R, ed . Gene transfer.
- Liposome Liposomes are formed spontaneously when phospholipids are suspended in an excess of aqueous medium. Liposome-mediated nucleic acid delivery has been very successful as described in Nicolau and Sene, Biochim. Biophys . Acta, 721 : 185-190 ( 1982 ) and Nicolau et al . , Methods Enzymol . , 149 : 157-176 ( 1987 ) .
- Example of commercially accessible reagents for transfecting animal cells using liposomes includes Lipofectamine (Gibco BRL) . Liposomes entrapping the relaxin gene and nucleotide sequence of interest interact with cells by mechanism such as endocytosis , adsorption and fusion and then transfer the sequences into cells .
- a method for delivery a gene which comprises contacting the gene delivery system of this invention as described hereinabove to a biosample containing cells .
- the contacting is performed as conventional infection methods known in the art .
- the infection of hosts using viral vectors is well described in the above-cited publications .
- the relaxin-encoding sequence and nucleotide sequence to be delivered are introduced into cells by microinj ection (Capecchi , M . R . , Cell,
- a recombinant adenovirus which comprises an adenoviral ITR ( inverted terminal repeat) nucleotide sequence and a relaxin- encoding nucleotide sequence ; wherein a relaxin protein expressed enhances a penetration potency of the recombinant adenovirus into a tumor tissue and apoptosis of a tumor cell infected with the recombinant adenovirus .
- the relaxin protein expressed increases significantly a penetration potency of the recombinant adenovirus into a tumor tissue and apoptosis of a tumor cell infected with the recombinant adenovirus , making the therapeutic efficacy of the adenovirus considerably increased.
- adenoviral genome A small portion of adenoviral genome is known to be necessary as cis elements (Tooza , J. Molecular biology of DNA Tumor viruses, 2nd ed. Cold Spring Harbor Laboratory, Cold Spring Harbor, N . Y . ( 1981 ) ) , allowing substitution of large pieces of adenoviral DNA with foreign sequences , particularly together with the use of suitable cell lines such as 293.
- the recombinant adenovirus comprises the adenoviral ITR sequence as an essential sequence as well as the relaxin-encoding nucleotide sequence .
- the relaxin-encoding nucleotide sequence is inserted into either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted E3 region .
- the nucleotide sequence of interest to be delivered e . g .
- cytokine genes is inserted into the recombinant adenovirus , preferably into either the deleted El region (ElA region and/or ElB region, preferably, ElB region) or the deleted E3 region, more preferably, the deleted El region (ElA region and/or ElB region, most preferably, ElB region)
- the inserted sequences may be incorporated into the deleted E4 region .
- adenovirus can package approximately 105% of the wild-type genome , providing capacity for about 2 extra kb of DNA (Ghosh-Choudhury et al . , EMBO J. , 6 : 1733-1739 ( 1987 ) ) .
- the foreign sequences described above inserted into adenovirus may be further inserted into adenoviral wild- type genome .
- the recombinant adenovirus of this invention comprises the inactivated ElB 19 gene , inactivated ElB 55 gene or inactivated ElB 19/ElB 55 gene .
- inactivation in conj unction with genes used herein refers to conditions to render transcription and/or translation of genes to occur non-functionally, thereby the correct function of proteins encoded genes cannot be elicited .
- the inactivated ElB 19 gene is a gene incapable of producing the functional ElB 19 kDa protein by mutation ( substitution, addition, and partial and whole deletion) .
- the defect ElB 19 gives rise to the increase in apoptotic incidence and the defect ElB 55 makes a recombinant adenovirus tumor- specific ( see Korean Pat . Appln . No . 10-2002-0023760 ) .
- the recombinant adenovirus of this invention comprises the active ElA gene .
- the adenovirus carrying the active ElA gene is replication- competent .
- the recombinant adenovirus of this invention comprises the inactivated ElB 19/ElB 55 gene and active ElA gene .
- the recombinant adenovirus comprises the inactivated ElB 19/ElB 55 gene, the active ElA gene and the relaxin-encoding sequence in place of deleted E3 region .
- the recombinant adenovirus of this invention comprises a structure of "ITR-ElA- ⁇ ElB-promoter-relaxin gene-poly A sequence" in which the promoter-relaxin gene-poly A sequence is present in the deleted E3 region .
- the exemplified adenovirus of this invention has a genetic map represented by Ad- ⁇ EIB-RLX in Fig . 1.
- the recombinant adenovirus of this invention shows highly improved transduction (penetration) efficiency into tumors compared to conventional anti-tumoric adenoviruses and apoptosis potency as well . These improved efficacies are ascribed mainly to relaxin to effectively degrade extracellular matrix and increase apoptotic potential . Consequently, the recombinant adenovirus of this invention exhibits dramatically enhanced oncolytic effect .
- Tumor tissues are not agglomerates composed solely of tumor cells but complicated structure further comprising blood vessel and normal cells .
- the connective tissue in tumor tissues is generally rigid and forms tight extracellular matrix surrounding tumor cells . Therefore , anticancer drugs as well as viruses cannot penetrate effectively into tumors , so that they generally exhibit a limited anti-tumor effect .
- Such obstacles can be overcome using the recombinant adenovirus of this invention containing the relaxin gene .
- the adenovirus of this invention with the inserted relaxin gene actively spreads even into the center of tumor spheroids as well as their surface .
- the relaxin- expressing adenovirus of this invention spreads widely and remotely to the distal site from inj ection site (needle track) .
- the improvement in the transduction efficiency accomplished- by the relaxin-expressing adenovirus is obvious even to be easily differentiated with naked eyes .
- transduction efficiency is very considerable compared to about 2-3 fold increase in transduction efficiency of pretreatment of proteases such as collagenase/dispase or trypsin, elastase to degrade elasitin or hyaluronidase to degrade extracellular matrix .
- proteases such as collagenase/dispase or trypsin, elastase to degrade elasitin or hyaluronidase to degrade extracellular matrix .
- a pharmaceutical anti-tumor- composition for treating a cancer which comprises (a) a therapeutically effective amount of the recombinant adenovirus described previously; and (b) a pharmaceutically acceptable carrier .
- a method for treating a cancer which comprises administering to an animal the pharmaceutical anti-tumor composition of described above .
- the recombinant adenovirus as an active ingredient in the pharmaceutical composition is the adenovirus of the present invention described hereinabove and therefore the above descriptions can be adapted to the recombinant adenovirus of the pharmaceutical composition . Accordingly, the common descriptions between them are omitted in order to avoid undue redundancy leading to the complexity of this specification .
- a successful cancer-gene therapy using adenoviruses requires enhanced safety as well as high therapeutic benefit .
- the relaxin-expressing adenovirus of this invention increases both viral spreading and apoptosis to exhibit significantly increased anti-tumor effect .
- the recombinant adenovirus of this invention having deleted ElB 55 gene shows excellent tumor-specificity in cytotoxicity .
- the relaxin-expressing adenovirus of this invention allows to decrease a dosage for cancer therapy, reducing significantly toxicity to normal cells and undesirable immune reactions in vivo
- the pharmaceutical composition of this invention is useful in treating tumor-related diseases , including stomach cancer, lung cancer, breast cancer, ovarian cancer, liver cancer, bronchogenic cancer, nasopharyngeal cancer, laryngeal cancer, pancreatic cancer, bladder cancer, colon cancer, and uterine cervical cancer .
- treatment refers to
- the term "therapeutically effective amount" as used herein means an amount sufficient to achieve the pharmaceutical effect described above .
- the pharmaceutically acceptable carrier contained in the pharmaceutical composition of the present invention which is commonly used in pharmaceutical formulations , but is not limited to, includes lactose, dextrose, sucrose, sorbitol , mannitol , starch, rubber arable, potassium phosphate, arginate, gelatin, potassium silicate , microcrystalline cellulose, polyvinylpyrrolidone, cellulose , water, syrups , methyl cellulose, methylhydroxy benzoate, propylhydroxy benzoate, talc, magnesium stearate , and mineral oils .
- the pharmaceutical composition according to the present invention may further include a lubricant, a humectant, a sweetener, a flavoring agent , an emulsifier, a suspending agent, and a preservative .
- the pharmaceutical composition according to the present invention may be administered via the routes used commonly in gene therapy, and preferably, administered parenterally, i . e . , by intravenous , intraperitoneal , intramuscular, subcutaneous , or local administration .
- the pharmaceutical composition may be administered intraperitoneally to treat ovarian cancer and intravenously to treat liver cancer, directly inj ected to visible tumor mass to treat breast cancer, directly inj ected to enema to treat colon cancer, and directly inj ected to a catheter to treat bladder cancer .
- a suitable dosage amount of the pharmaceutical composition of the present invention may vary depending on pharmaceutical formulation methods , administration methods , the patient' s age, body weight, sex, pathogenic state, diet, administration time , administration route , an excretion rate and sensitivity for a used pharmaceutical composition, and physicians of ordinary skill in the art can determine an effective amount of the pharmaceutical composition for desired treatment .
- the pharmaceutical composition of the present invention comprises 1 x 10 5 - I x 10 15 pfu/ml of a recombinant adenovirus , and 1 x 10 10 pfu of a recombinant adenovirus is typically inj ected once every other day over two weeks .
- the pharmaceutical composition comprising the recombinant adenovirus according to the present invention may be formulated with pharmaceutically acceptable carrier and/or vehicle as described above , finally providing several forms a unit dose form and a multi-dose form.
- the formulations include, but not limited to, a solution, a suspension or an emulsion in oil or aqueous medium, an extract, an elixir, a powder, a granule, a tablet and a capsule , and may further comprise a dispersion agent or a stabilizer .
- the pharmaceutical composition comprising the recombinant adenovirus according to the present invention may be utilized alone or in combination with typical chemotherapy or radiotherapy . Such combination therapy may be more effective in treating cancer .
- the chemotherapeutic agents useful for the combination therapy include cisplatin, carboplatin, procarbazine, mechlorethamine, cyclophosphamide , ifosfamide , melphalan, chlorambucil , bisulfan, nikosourea, dactinomycin, daunorubicin, doxorubicin, bleomycin, plicomycin, mitomycin, etoposide , tamoxifen, taxol , transplatinum, 5-fluorouracil , vincristin, vinblastin and methotrexate .
- Examples of the radiotherapy useful for the combination therapy include X-ray illumination and ⁇ -ray illumination .
- a pharmaceutical composition for improving a penetration potency of a medicament into a tissue which comprises (a) a relaxin protein to improve the penetration potency of the pharmaceutical composition into the tissue; and (b) a pharmaceutically acceptable carrier .
- the relaxin protein contained the pharmaceutical composition of this invention may be obtained from natural sources and conventional DNA recombinant technologies . Furthermore , its fragments are encompassed in the present invention unless they are inactive in the degradation of extracellular matrix .
- the pharmaceutical composition may be administered prior to or simultaneously with administration of certain medicament .
- the pharmaceutical composition may further comprise a medicament .
- the pharmaceutical composition of this invention degrades extacellular matrix surrounding tissues to be targeted by medicaments to enhance tissue penetration of medicaments , increasing significantly a pharmacological efficacy of medicaments .
- the pharmaceutical acceptable carrier, administration route and method, and formulation for the present pharmaceutical composition are described with referring to descriptions for the pharmaceutical anti-tumor composition of this invention as discussed previously .
- the present pharmaceutical composition is preferably administered parenterally, e . g . , by intravenous , intraperitoneal , intramuscular, subcutaneous or transdermal and local (e . g . , direct injection into brain or breast tumor mass ) administration .
- the pharmaceutical composition of this invention may be administered in a dosage of 0.0001-100 mg/kg .
- the medicament to show improved tissue penetration by the pharmaceutical composition of this invention includes chemical drugs and biodrugs, preferably, drugs whose tissue penetration is deteriorated by extracellular matrix, e . g . , anticancer drugs .
- a pharmaceutical composition for treating a disease or condition associated with accumulation of excess extracellular matrix which comprises (a) a therapeutically effective amount of a relaxin protein or a gene delivery system comprising a relaxin-encoding nucleotide sequence ; and (b) a pharmaceutically acceptable carrier .
- the pharmaceutical composition of this invention degrades effectively extracellular matrix surrounding tissues to have a therapeutic efficacy on a disease or condition associated with accumulation or deposition of excess extracellular matrix .
- accumulation of excess extracellular matrix means excessive deposition of components of extracellular matrix such as collagen, laminin, fibronectin and proteoglycan to damage tissues or organs , finally causing fibrosis .
- the diseases or conditions associated with excessive accumulation of extracellular matrix to be treated by the present pharmaceutical composition are fibrosis-related diseases , including, , but not limited to, scar, liver cirrhosis , pulmonary fibrosis , glomerular nephritis , adult or acute dyspnea, hepatic fibrosis , renal fibrosis , mycocardial fibrogenesis following myocardial infarction, fibrocystic disorder, fibrotic cancer, veno-occlusive syndrome and renal stroma fibrosis .
- fibrosis-related diseases including, , but not limited to, scar, liver cirrhosis , pulmonary fibrosis , glomerular nephritis , adult or acute dyspnea, hepatic fibrosis , renal fibrosis , mycocardial fibrogenesis following myocardial infarction, fibrocystic disorder, fibrotic cancer, veno-occlusive syndrome
- Both scar caused by wound, burn or operation and excessive scar such as keloid may be treated with the pharmaceutical composition of this invention .
- the gene delivery system comprising a relaxin-encoding nucleotide sequence can be described with referring to descriptions of the gene delivery system of this invention discussed hereinabove .
- the relaxin protein contained the pharmaceutical composition of this invention may be obtained from natural sources and conventional DNA recombinant technologies . Furthermore, its fragments are encompassed in the present invention unless they are inactive in the degradation of extracellular matrix .
- the pharmaceutical acceptable carrier, administration route and method, and formulation for the present pharmaceutical composition are described with referring to descriptions for the pharmaceutical anti-tumor composition of this invention as discussed previously .
- the present pharmaceutical composition is most preferably administered by transdermal administration .
- the formulations suitable in the present pharmaceutical composition include ointment, gel , cream, solution, spray, patch and lotion .
- the pharmaceutical composition of this invention may be administered in a dosage of 0.0001-100 mg/kg .
- the present invention provides a novel gene delivery system and recombinant adenovirus comprising the relaxin-encoding sequence, a gene delivering method using the gene delivery system, a pharmaceutical anti-tumor composition comprising the recombinant adenovirus , a pharmaceutical composition characterized by improved tissue penetration potency and a pharmaceutical composition for treating a disease or disorder associated with accumulation of excess extracellular matrix .
- relaxin is responsible for the improvement in transduction efficacy and apoptotic ability to increase tumor cell killing potential dramatically .
- Fig . 1 schematically represents a genetic map of the recombinant adenoviruses used in Examples .
- Fig . 2 is a graph showing relaxin expression profiles of the recombinant adenovirus of this invention .
- Fig . 3 is a photograph representing in vi tro tissue penetration of the relaxin-expression adenovirus of this invention into tumors such as U343 , U87MG, C33A and A549.
- Fig . 4 is a photograph representing in vivo tissue penetration of the relaxin-expression adenovirus of this invention into tumors such as U343, U87MG, C33A, Hep3B and A549.
- Fig . 5 represents the results of CPE (cytopathic effect) analysis demonstrating cell killing potency of the relaxin- expressing adenovirus of this invention .
- Fig . 6 represents the results of plaque development assay of the relaxin-expressing adenovirus of this invention .
- Fig . 7 shows the results of flow cytometry analysis for subGi cell population verifying the ability of the recombinant adenovirus of this invention to induce apoptosis .
- Fig . 8 shows the results of flow cytometry analysis for Annexin-V and PI dual staining verifying the ability of the recombinant adenovirus of this invention to induce apoptosis .
- Fig . 9 represents the results of TUNEL assay for DNA fragmentations demonstrating the ability of the recombinant adenovirus of this invention to induce apoptosis .
- Fig . 10 represents in vivo anti-tumor effect of the relaxin- expressing adenovirus of this invention
- Fig . 11 represents the increase in survival rate of tumor- bearing mice inj ected with the relaxin-expressing adenovirus of this invention .
- Fig . 12 represents histological changes of tumors in tumor- bearing mice inj ected with the relaxin-expressing adenovirus of this invention .
- Fig . 13 represents collagen distribution within tumors in tumor-bearing mice inj ected with the relaxin-expressing adenovirus of this invention .
- Fig . 14 represents inhibitory effect of the recombinant adenovirus of this invention on spontaneous pulmonary metastasis .
- B16BL6 tumor-bearing mice were treated with PBS , Ad- ⁇ EIB, or Ad- ⁇ EIB-RLX three times every other day, and then the primary tumors were surgically removed .
- the weight of metastatic lesions in the lungs of the mice was assessed .
- Each point represents the tumor burden for every individual mouse ( 5 mice per group) and the mean weight of metastatic lesions for each group is shown with a line .
- Fig . 15 is a photograph demonstrating the transduction efficiency and penetration potency of the relaxin-expressing adenovirus of this invention to keloid cells , cell spheroids and tissue spheroids .
- the following specific examples are intended to be illustrative of the invention and should not be construed as limiting the scope of the invention as defined by appended claims .
- Cell lines for experiments were human brain cancer cell lines (U343 , U87MG) , cervical cancer cell line (C33A) , liver cancer cell line (Hep3B) , lung cancer cell line (A549) and 293 cell line carrying the early gene of adenovirus , El region available from the American Type Culture Collection (ATCC) . All cell lines were cultured in Dulbecco' s modified Eagle' s medium (DMEM; Gibco BRL) supplemented with 10% fetal bovine serum
- the pcDNA-hygro-LacZ plasmid ( Invitrogen, Carlsbad, CA, USA) was digested with Hindi11 and Nael to isolate the CMV promoter, lacZ gene and polA and the isolated three sequences were inserted into the El adenoviral shuttle vector, p ⁇ ElsplA to prepare p ⁇ ElsplA/CMV-LacZ shuttle vector .
- the prepared p ⁇ ElsplA/CMV-LacZ shuttle vector was digested with Xmnl and cotransformed with vmdl324Bst adenovirus linearized by BstBI into E. coli BJ5183 (Dr . Verca, University of Fribourgh, Switzerland) to induce homologous recombination, obtaining pdl- LacZ adenovirus .
- pDNR-LIB- RLX ATCC, #MGC-14599
- Sall-Hindll l 1 kb DNA fragment which in turn was subcloned into the pCAl4 vector (Microbix, Ontario, Canada) , generating a pCAl4-RLX .
- the nucleotide sequences of relaxin used in the Example is published under GenBank accession No . BC005956.
- a CMV- RLX-polA expression cassette was excised from the pCA14-RLX using BgIII and subsequently inserted into the adenovirus E3 shuttle vector pSP72 ⁇ E3 ( Promega, Madison, WI , USA) to construct a pSP72 ⁇ E3-cRLX E3 shuttle vector .
- the constructed pSP72 ⁇ E3-cRLX E3 shuttle vector was linearized with Xmnl and then cotransformed with the pdl-LacZ into E. coli BJ5183 ( Dr .
- dl-LacZ-RLX or dl-Z-RLX
- Fig . 1 The dl-Z-RLX adenovirus was deposited in the Korean Culture Center of Microorganisms (KCCM) with the Accession No . KCCM-10567 on March 19, 2004.
- KCCM Korean Culture Center of Microorganisms
- the pSP72 ⁇ E3-cRLX E3 shuttle vector prepared above was linearized with Xmnl and cotransformed into E.
- Ad- ⁇ EIB-RLX adenovirus vector ( Fig . 1 ) .
- the Ad- ⁇ EIB-RLX adenovirus was deposited in the Korean Culture Center of Microorganisms (KCCM) with the Accession No . KCCM-10566 on March 19, 2004.
- ⁇ denotes a sequence comprising ITR ( inverted terminal repeat) and the package signal
- Ad represents adenovirus
- CMV represents the CMV promoter
- Pol A is the poly A sequence
- IX represents a gene encoding the IX protein .
- the plasmid DNA was digested with HindiI I and the digestion pattern was analyzed .
- the proper homologous recombinant adenoviral plasmid DNA was digested with Pad and transfected into 293 cells to generate dl-lacZ-RLX and Ad- ⁇ EIB-RLX adenoviruses .
- viruses were propagated in 293 cells and their titration was performed according to limited dilution or plaque assay (Hitt, M. et . al . , Construction and propaga tion of human adenovirus vectors . Cell biology: a labora tory handbook. New York : Academic Press Inc, 479-490 ( 1994 ) ) , followed by concentration using CsCl gradient and purification .
- Ad- ⁇ EIB (with deleted ElB region) was ⁇ constructed and produced using the pCA14 as El shuttle vector according to procedures described previously .
- Human cervical cancer cell line C33A was infected with dl- LacZ-RLX or Ad- ⁇ EIB-RLX, or dl-LacZ or Ad- ⁇ E1B19 adenovirus (KFCC-11288 ) at MOI (multiplicity of infection) of 1-50 and medium used was recovered after 24 hr .
- MOI multiplicity of infection
- the expression of relaxin was analyzed using the ELISA kit ( Immune diognostik, Benshem, Germany) according to the manufacturer' s protocol .
- U343 , U87MG, C33A and A549 xenografts were established subcutaneously by injecting cells into the abdomen of 6- to 8- week-old nude mice and once the tumors reached to 150-200 mm 3 in volume , fresh tumor tissue was extracted at surgery . 1-2 mm fragments of the tumor tissue were dissected. These explants were plated individually on 0.75% agarose-coated plates and cultured in DMEM (Gibco BRL) supplemented with 5% FBS (Gibco BRL) and penicillin/streptomycin (Gibco BRL) at 37°C under 5% CO 2 atmosphere . Medium was renewed once every week .
- spheroids with diameter of 2 mm were transferred to 0.75% agarose-coated 48-well plates and 150 ⁇ l of DMEM (containing 5% FBS ) were added, after which viruses were added at IxIO 6 , Ix 10 7 , or 1 x 10 8 PFU . 48-hr later, the medium was aspirated and spheroids were fixed in a fixation solution for X-gal staining . The surface of X-gal stained spheroids was observed under a stereoscopic microscope . For the observation on penetration bf adenovirus into tumor spheroid, the X-gal stained tumor spheroids were embedded in O . C . T . compound ( Sakura Finetec, Torrance, CA) and snap frozen . 8 ⁇ m frozen section was then placed onto gelatin-coated slide glass . Evaluation on spreading and penetration of dl -LacZ-RLX in vivo
- U343 , U87MG, C33A, Hep3B and A549 xenografts were established subcutaneously by inj ecting cells into the abdomen of 6- to 8-week-old nude mice and once the tumors reached to 150-200 mm 3 in volume, mice were randomized into two groups and dl-LacZ-RLX adenovirus at 5 x 10 7 - I x 10 8 PFU in 50 ⁇ l was intratumorally inj ected into the tumors three times .
- mice were sacrificed and tumors were taken for virus distribution, after which they were fixed in 4% paraformaldehyde at 4 °C for 4-8 hr and dehydrated in 30% sucrose solution for 12 hr .
- the dehydrated tumor tissues were frozen in O . C . T . compound and dissected to sections with 8 ⁇ m thickness , followed by placing them onto gelatin-coated slide glass for X-gal staining .
- human tumor cell lines (U343, U87MG, C33A, Hep3B and A549) were plated onto 24-well plates and then infected with Ad- ⁇ El , Ad- ⁇ ElB, or Ad- ⁇ EIB-RLX adenovirus at MOIs 0.1-10.
- Ad- ⁇ El Ad- ⁇ ElB
- Ad- ⁇ EIB-RLX Ad- ⁇ EIB-RLX adenovirus
- human tumor cell lines U343 , U87MG, C33A, Hep3B and A549, were introduced to 25T culture flasks and 24 hr later, infected with Ad- ⁇ EIB or Ad- ⁇ EIB-RLX adenovirus at an MOI of 0.5-5.
- Cells were treated with 0.1-1 ⁇ M CPT-Il (camptothecin) as a positive control and treated with PBS as a negative control . After 48 hr, 72 hr and 96 hr of infection, the infected cells were collected and fixed in 70% ethanol at 4 °C for 24 hr .
- U343 ( 5 x 10 4 ) , U87MG ( 5 x 10 4 ) , C33A ( 5 x 10 5 ) , Hep3B ( 4 x 10 5 ) , and A549 ( 5 x lO 4 ) cells were plated onto a chamber slide and then infected with adenovirus at an MOI of 0.2-20. Following 24 hr and 48 hr of infection, medium was removed and TUNNEL assay was carried out according to the manufacturer' s instruction of ApopTag kit ( Intergen, Purchase, NY) . For color development, cells were incubated with peroxidase-conjugated streptavidin and then diaminobenzidine ( DAKO, Carpinteria, CA) . At the time that color of cells became brown, cells were counterstained with 0.5% methyl green for 10 min and observed under microscope in more than 4 selected fields . The ratio of stained cells to total cells was calculated .
- the immunohistochemistry staining for the hexon region of adenoviruses was carried out .
- the slides were deparaffinized as described above and incubated with the primary anti-adenoviral hexon antibody, AB1056F (Chemicon,
- TUNNEL assay was carried out according to the manufacturer' s instruction of ApopTag kit ( Intergen, Purchase, NY) .
- ApopTag kit Intergen, Purchase, NY
- cells were incubated with peroxidase- conj ugated streptavidin and then diaminobenzidine (DAKO, Carpinteria, CA) .
- DAKO diaminobenzidine
- cells were counterstained with 0.5% methyl green for 10 min and observed under microscope .
- Spontaneous metastasis model was used to examine the effect of relaxin gene administration on tumor metastasis . More specifically, B16BL6 cells (2 x lOVmouse ) were administered subcutaneously into the right hind foot pad of 6-week-old male C57BL/6 mice (Charles River Korea, Seoul , Korea) . Once the tumor volume reached to a volume of 100-200 mm 3 , animals were randomized into three groups ( PBS , Ad- ⁇ EIB, Ad- ⁇ ElB-RLX) of 5 animals each, and treatment was initiated .
- adenoviruses or PBS were inj ected directly into the tumor ( 5 x 10 8 PFU per tumor in 50 ⁇ l of PBS ) on days 1 , 3 , and 5.
- the primary tumors were surgically removed by amputating below knee under mild anesthesia .
- the weight of metastatic tumor lesions in the lungs of the mice was assessed.
- the gene transduction efficiency to keloid cells was assessed as follows : The primary keloid cell line at passage 2 obtained from keliod patients was transferred to 24-well plates and then infected with Ad- ⁇ EIB or Ad- ⁇ ElB-RLX virus at MOI of 10 or 50 , followed by X-gal staining after 2 days of virus infection .
- the gene transduction efficiency to keloid cell spheroid was assessed as follows : The keloid tissues were extracted from keliod patients . 1 x 10 5 /ml of primary cells at passage 2 obtained from the extracted keloid tissues were transferred to a culture tube and centrifuged at 500 x g for 5 min, after which they were cultured at 37 ° C . When the round pellet detached from the bottom of the tube appeared as a cell spheroid over 1-5 days of culture , the spheroid was transferred to 0.75% agarose-coated 48-well plate and 150 ⁇ l of DMEM
- adenoviruses at 1 x 10 7 PFU were infected to the spheroid .
- the keolid spheroid was fixed in a fixation solution and X-gal stained.
- the surface of X-gal stained spheroids was observed under a stereoscopic microscope .
- the X-gal stained keloid spheroids were embedded in O . C . T . compound and snap frozen . 10 ⁇ m frozen section was then placed onto gelatin- coated slide glass .
- the penetration of virus into keloid tissue spheroid was analyzed as follows : The keloid tissues were extracted from keliod patients and dissected to 1-2 mm sections . The sections were cultured in 0.75% agarose-coated incubator in DMEM containing 5% FBS and penicillin/streptomycin . The medium used was refreshed once or twice every week and the keloid tissues were cultured for more than one week . Keloid tissue spheroids in a diameter of 2 mm were transferred to 0.75% agarose-coated 48-well plate and 150 ⁇ l of DMEM ( containing 5% FBS ) were added, followed by the infection with 1 x 10 8 PFU adenoviruses .
- the keolid tissue spheroid was fixed in a fixation solution and X-gal stained.
- the surface of X-gal stained spheroids was observed under a stereoscopic microscope .
- the X-gal stained keloid spheroids were embedded in O . C . T . compound and snap frozen . 10 ⁇ m frozen section was then placed onto gelatin-coated slide glass .
- replication-incompetent dl-LacZ-RLX adenoviruses expressing LacZ as a reporter were constructed . Furthermore, tumor- specific oncolytic Ad- ⁇ EIB-RLX adenovirus was constructed to enhance the transduction efficiency of replication-competent adenovirus into tissues ( Fig . 1 ) .
- a cervical cancer cell line , C33A was infected with dl-LacZ , dl-LacZ-RLX, Ad- ⁇ EIB or Ad- ⁇ EIB-RLX adenoviruses at various MOIs and media were recovered for ELISA ( Fig . 2) .
- tumor cell lines were subcutaneously inj ected into nude mice and once the tumors reached to 150-200 mm 3 in volume , fresh tumor tissues was extracted .
- the tumor tissues extracted were dissected into 1-2 mm fragments and infected with adenoviruses at 1 x 10 6 , 1 x 10 7 , or 1 x 10 8 PFU .
- X-gal staining was carried out after 48 hr of infection .
- dl-LacZ-RLX Compared to the treatment of 1 x 10 6 PFU dl-LacZ, the same dose of dl-LacZ-RLX showed stronger X- gal staining on the surface of tumor spheroid. dl-LacZ-RLX at 1 x 10 7 and 1 x 10 8 PFU led to darker X-gal staining on the overall surface of tumor spheroid . To accurately investigate the penetration efficiency of adenoviruses into tumor spheroids , X-gal-stained tumor spheroids were sectioned for observation .
- dl-LacZ at 1 x 10 6 , 1 x 10 7 or 1 x 10 8 PFU exhibited poor LacZ expression in tumor tissues and its spread was limited to the surface of tumor spheroids .
- the same doses of dl- LacZ-RLX showed much higher LacZ expression level and its spread was extended to the inner part of tumor spheroids ( Fig . 3) .
- dl-LacZ or dl-LacZ-RLX adenovirus at 5 x 10 7 or 1 x 10 8 PFU was intratumorally inj ected into the tumor mass formed in the abdomen of nude mice . Three days later, tumors were taken and sectioned for X-gal staining .
- dl-LacZ While dl-LacZ exhibited the low level of LacZ expression and the stained region was restricted to the virus injection site, dl-LacZ-RLX showed much higher LacZ expression and the stained region was found to be widely spread to other regions than the virus inj ection site ( Fig . 4 ) .
- U87MG and C33A tumor mass transduced with dl-LacZ-RLX showed dark blue color ascribed to intensive LacZ expression throughout all the tumor tissues .
- a CPE assay was carried out .
- Each of human tumor cell lines (U343 , U87MG, C33A, Hep3B and A549 ) was infected with dl-LacZ (negative control ) , Ad- ⁇ EIB or Ad- ⁇ EIB-RLX adenovirus at MOIs 0.1-10 and the resulted tumor cell killing effects were analyzed . As shown in Fig .
- Ad- ⁇ EIB-RLX exhibited about 2-10 fold higher tumoricidal effect than Ad- ⁇ EIB not to express relaxin .
- Ad- ⁇ EIB-RLX adenovirus showed about 10-fold higher tumoricidal effect than Ad- ⁇ EIB in Hep3B cell line
- Ad- ⁇ EIB-RLX showed about 5-fold higher tumoricidal effect than Ad- ⁇ E1B in U87MG, C33A and A549 cell lines . According to the results , it could be understood that the relaxin expression does not deteriorate a replication competency of adenoviruses and contributes to the dramatic increase in tumoricidal effect of adenoviruses .
- plaque formation in a solid medium containing agarose was compared.
- Hep3B cells were infected with Ad- ⁇ EIB or Ad- ⁇ ElB-RLX adenovirus at 3 MOI and plaque formation was then analyzed .
- plaques were formed in shorter time for Hep3B cells infected with Ad- ⁇ ElB-RLX than those infected with Ad- ⁇ E1B .
- plaques formed in Hep3B cells infected with Ad- ⁇ ElB-RLX showed lager size than those in , Hep3B cells infected with Ad- ⁇ ElB .
- the replication incompetent adenovirus , dl-LacZ-RLX was revealed to induce the death of cells that were detached from the bottom of culture plates . Therefore, we examined whether relaxin expression is responsible for cytotoxic effect . Firstly, to determine whether relaxin induces apoptosis , flow cytometric assay was carried out after PI staining for analyzing an increase rate of subGi cell population containing randomly fragmented DNAs due to apoptosis .
- a representative of human tumor cell lines was infected with Ad- ⁇ EIB or Ad- ⁇ ElB-RLX adenovirus and harvested after 48-96 hr post-infection for measuring an increase in subGi cell population ( Fig . 7 ) .
- CPT-Il was used as a positive control for the induction of apoptosis .
- Ad- ⁇ EIB induced about 3.11% of SUbG 1 cell population and Ad- ⁇ E1B-RLX elicited the significantly increased SUbG 1 cell population, 22.90% .
- Such increased subGi cell population was also observed in other cell lines (U343 , U87MG, C33A and Hep3B) .
- Annexin-V is used to detect the translocation of phosphatidylserin ( PS ) to the external membrane leaflet as an early marker for apoptosis
- PI is used to identify necrosis by binding to nuclear chromatin as a late marker for apoptosis . Therefore , Annexin-V " /PI ⁇ , Annexin-V + /PI " and PI + represents healthy, apoptotic and necrotic cells , respectively .
- tumors treated with Ad- ⁇ EIB or Ad- ⁇ EIB-RLX adenovirus showed 10-30 fold higher anti-tumor effect than those treated with PBS .
- Ad- ⁇ EIB and Ad- ⁇ EIB-RLX adenoviruses led to the tumor volume of 399.68196.95 mm 3 and 64.51+36.73 mm 3 , respectively, reasoning that the relaxin-expressing adenovirus has stronger anti-tumor potency than Ad- ⁇ EIB .
- Ad- ⁇ EIB-RLX adenovirus completely eradicated tumor in 2 mice of 7 mice at day 19 post- viral infection and wiped out tumor in 5 mice at day 41 postinfection . Also, the regrowth of tumor was not observed even after 60 days post-infection .
- the analysis of anti-tumor effects was carried out for C33A, A549, Hep3B and U343 xenografts .
- Ad- ⁇ EIB-RLX adenovirus replicates actively in the viral inj ection site, contributing to the induction of apoptosis and necrosis .
- Human brain tumor cell line U343 formed in nude mice was inj ected three times with Ad- ⁇ ElB or Ad- ⁇ EIB-RLX . Following 3 days of inj ection, the tumor tissues were extracted and stained with Masson' s trichrome to analyze the distribution of collagen ( stained blue color) , a major component of extracelluar matrix , trichrome stain) .
- Tumors treated with PBS or Ad- ⁇ ElB consisted of high content of collagen (blue staining) .
- tumors treated with Ad- ⁇ EIB-RLX appeared to be devoid of collagen, indicating that relaxin expression dramatically reduced the collagen content within the tumor mass .
- tumors treated with Ad- ⁇ EIB-RLX were encapsulated by connective tissue , and blue-staining was only found in the boundary between tumor and normal tissue ( Fig . 13 ) .
- Relaxin has been known to induce MMP expression, which can possibly increase the metastatic potential .
- a spontaneous tumor metastasis model in which B16BL6 melanoma cells were implanted subcutaneously to form a local primary tumor on the foot pad of C57BL/6 mice .
- PBS Ad- ⁇ EIB or Ad- ⁇ EIB-RLX .
- the primary tumors were surgically removed by amputating below knee under mild anesthesia .
- the weight of metastatic tumor lesions in the lungs of the mice was measured to assess metastases to distant organs .
- the average relative tumor burden in the lung from mice treated with Ad- ⁇ EIB and Ad- ⁇ EIB-RLX was 48 ⁇ 0.05 mg and 1010.01 mg, respectively, compared to PBS-treated control group (268+0.27 mg) , showing 82% and 96% inhibition, respectively .
- both Ad- ⁇ EIB and Ad- ⁇ EIB-RLX completely inhibited the formation of metastatic lesions .
- Keloid is one of disorders caused by the extensive formation of extracellular matrix .
- the primary keloid cell line obtained from keliod patients was infected with dl- LacZ or dl-LacZ-RLX adenovirus at an MOI of 10 or 50 and subj ect to X-gal staining after 2 days .
- keloid cell spheroids prepared using primary keloid cells from keloid patients were infected with dl-LacZ or dl-LacZ-RLX adenovirus at 1 x 10 7 PFU and subj ect to X-gal staining for microscopic observation .
- the surface of keloid cell spheroids was more intensively stained for dl-LacZ-RLX than dl-LacZ ( Fig . 15 ) .
- keloid tissues from patients were infected with dl-LacZ or dl-LacZ-RLX at 1 x 10 8 PFU and subject to X-gal staining for microscopic observation ( Fig . 15 ) . While dl-LacZ-treated keloid tissues showed weak LacZ expression, dl-LacZ-RLX-treated keloid tissues were intensively X-gal stained . Furthermore , in order to assess the penetration efficiency of adenoviruses into keloid tissues , the infected tissues were were embedded in O . C .
- the present invention provides a novel gene delivery system and recombinant adenovirus comprising the relaxin-encoding sequence , a gene delivering method using the gene delivery system, a pharmaceutical anti-tumor composition comprising the recombinant adenovirus , a pharmaceutical composition characterized by improved tissue penetration potency and a pharmaceutical composition for treating a disease or disorder associated with accumulation of excess extracellular matrix .
- relaxin is responsible for the improvement in transduction efficacy and apoptotic ability to increase tumor cell killing potential dramatically .
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AU2017371301B9 (en) * | 2016-12-09 | 2023-10-26 | Genemedicine Co., Ltd. | Anticancer composition comprising recombinant adenovirus expressing degradation factor for extracellular matrix |
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2005
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- 2005-03-30 KR KR1020050026808A patent/KR100749857B1/en active IP Right Grant
- 2005-03-30 JP JP2007506082A patent/JP4764872B2/en active Active
- 2005-03-30 CN CN2005800107101A patent/CN1968717B/en active Active
- 2005-03-30 US US10/599,521 patent/US20070202080A1/en not_active Abandoned
- 2005-03-30 WO PCT/KR2005/000921 patent/WO2006075819A1/en not_active Application Discontinuation
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2015
- 2015-02-20 US US14/627,583 patent/US20150368669A1/en not_active Abandoned
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2019
- 2019-05-02 US US16/401,614 patent/US20190323035A1/en not_active Abandoned
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- 2022-10-28 US US17/976,062 patent/US20230054820A1/en active Pending
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Also Published As
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EP1729817A4 (en) | 2008-07-09 |
CN1968717B (en) | 2013-08-21 |
US20070202080A1 (en) | 2007-08-30 |
EP1729817B1 (en) | 2014-03-05 |
US20190323035A1 (en) | 2019-10-24 |
US20230054820A1 (en) | 2023-02-23 |
KR100749857B1 (en) | 2007-08-16 |
JP2007531519A (en) | 2007-11-08 |
US20150368669A1 (en) | 2015-12-24 |
CN1968717A (en) | 2007-05-23 |
KR20060045056A (en) | 2006-05-16 |
JP4764872B2 (en) | 2011-09-07 |
WO2006075819A1 (en) | 2006-07-20 |
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